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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf49cb74bbd368707cbac899ec0ea3efc5e0247c20b6111e1e113d58d7b86a9b' 
  AND token = '+lpfGhfkGhp2HxUcljwd3xTr14ALyU09jC7nn1/rN5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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