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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099c642c6d7ee2c2342c6327ec7685982241f9f23036470c673eb72742f53c10' 
  AND token = 'ujbIDbemkw/6LI+1VdNQ4VrbD4voaAYTPz6fhRG2iR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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