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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297c46ae164e06dfba5a6f8b37e2b8fb2a3d8466f6681dd2aafadd849e08e6fa' 
  AND token = '63g3W+1yY8RX4e75i7qE/8iygh1/IuYVyTIGM+Biu/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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