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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e979b1594951a223d8a7f942da88a381afbe969d17098dd9207de49baa6c23aa' 
  AND token = 'ac6YYHT0JpzUR3dlvbhKFrcqEwtSGspHpJd1FEFQi4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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