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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3092f113ec98a81be879a2afe9525e1d7a4c0b19c1ef1689a4d75ce2dc5c7cd' 
  AND token = 'r4D+0ZEpQF4wDNNSEF6GxcGIKmVpdsuwCTqeXhD01Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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