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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb424ea7090ededdad334fa7a6e306257bced6dae1e562c348182f1c1e49783' 
  AND token = 'g+KrqCd4ZObt3zqOeMcXxONvQ6G78UmVA0AXVU6IzO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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