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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531e19424d523a58a12dba716d2c66d3ebeb1442696d81a9ba6ac7439ed87747' 
  AND token = 'XiLGmY3g2i3vXap0Y5u5DJQPuCKpfLeFioNGKtvh4i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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