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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f84ac34bef3a44e485c5dc17afdc8b167b99032b0d56aabd266d440b2473e76' 
  AND token = 'JE/y0ov20U/A1E9giL4idgVVuWd9Ir3L4VHa8Yj/Y9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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