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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e3b522fab67d18564dd57b4f882b3ee748ea53fa7e058bf64fffa56be73783' 
  AND token = '9Li8/HCRYTIJrr+fcp8IjmqtTlUiRvs/oIjZglvcGik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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