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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fbab2f6fda7474a7789370011af0d5e90b79dfcc899cf1a1bb128816187d30' 
  AND token = '6J4wwN8anwKucZ6RYWVARdlKV4ujeholZGoWf9Gc65w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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