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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda2f5639622bd0c4bc6691ea20e498b984bb8050b7fc76ea72d8ddec8291095' 
  AND token = 'K5ectYRYVxeLJo06OtGYgqoL2bbw09H9A+Zjm5R04MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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