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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d3446134e8a81d6ced8f88f3e4d0b70915f2608c2abc2cb9c6faf723eb4fd1' 
  AND token = 'bajEnYVwaFFkbRDB+A44RCRB6mPpIi1cpHSFMAIHpg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}