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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0428a76a444b4bbbaec49cf611f16c70b718e81b8ba5fbf46252f01ba25d6aa' 
  AND token = 'yOgUMGlidYhjh7Ec1LIy/sVzs5lxEqy0+F5eFvuBx7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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