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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94561a3252d647877d831da17a4650715a3a59d0e7d3bf192f2831087674934e' 
  AND token = 'dzepbGuJXayEo47aZjs2beC5yJg0rL4l8fiL9xwAYNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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