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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e050285e30985a815481388a8fad428dffd5872389cde96bcdf3189a5ecdf903' 
  AND token = 'SjRkfKp8W/I493wFYrXNxAKebAi3ndX68VfJRNX+pW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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