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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b27a0726de8b02aaa682b15ecc4421ad698e0259a1fb1d4efabad9cec3ff2d8' 
  AND token = '9A7Ah1uCK8fI8gZa67oT0UdIktY4LpzWpVmwXKlwHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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