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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc69a84762def1cb6fdebe5a870f7d01b3a0db2e4aab683136fae1dadd33bc1' 
  AND token = 'GDR+/2kfIBbjLncSg3gkVvqKbMTqOjB3MlkHIAHYEq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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