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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581cae6f74f6dc3dd9cb2c4b965c2c9eaa7c17f3a98853609efe0c917f07bb62' 
  AND token = 'kaSebM0Qb+eq8ZB932ayt7qEaqJh86LYuG8J9dzO2S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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