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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2034e6f737851c7c46fb25d0f0dd126d841e85cd31f9f2aa2d233a556841f1c3' 
  AND token = 'ia8vHb+C8UHpR/a54JZ7fHr/8jV3jSghTMrIoVn1J6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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