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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471b3ac679921deb792311088e2d64e8b6a14e4e61540ea98f4077feac174cf1' 
  AND token = '9D9KU3tlIQpl+ZMiH4rs07P8iyF1rVZ4SvH8XMA7LVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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