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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c03313331685890882515d00e177cb3e5cff3492a6af69c1bb4c120dd5f7331' 
  AND token = '9LeLkScQlM0GQnpbMLnvwAk2Q2NLPnuISI8/hSBczSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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