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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70dd33382ada7b434e8bde7b4eba694e589c12a69a066bf94ec342384f0953a' 
  AND token = 'i7YDkmg25TmGX9b4ZpDJrxU1T70v+GczN1pDm8/kHqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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