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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fd1b0f2fe42a454c37a89904ff832bce9519955fb227b156b6e86102a384df' 
  AND token = 'Z3SpoBBeH2kGRoPZxGnPDZ53gOBUb7j7ptPZkQBUjcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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