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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af2b2890910cbee769fff257e9a3349b759ce81ac8eb5e397fc3c571aeb99be' 
  AND token = '9c+R1Pyvbn1LucfI4xXItrOKdwpbsMaix26Yff/fza8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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