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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0053f7172691e0dbbb75bc7e8a7c2bb7bd883622a4ecf62101f9cb0b4bc3a7e7' 
  AND token = 'FEiwRjhbUxmZz+q62kmfZgAN20pZsbxRl0/gQvtjNUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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