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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5705b02b0b32bdd8ddb453501616687c0e5b6597f67d3394a6282ae7f19ec7' 
  AND token = 'sROLUmMRSQfR8xRm7Maoeh6BYMqb0OWYfPSqHv/yd/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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