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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeea733c6fb2b8e10dc522da8ff492d3415a94153d9e314abc4f435c51b0645d' 
  AND token = 'nLpLZ2ppdEorhz7V9DRsEIBsP96fxpiC/MO5hqdm9TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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