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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972d4e1e80a98732e7d78d0c215c72a3406fd72bdd48ebbef2edc948a885fbbf' 
  AND token = 'ncxL0OS7fjuBTLbtPad1WqSY5S3zHljFEYEEZ1obPzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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