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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994def52807371e8f6ff466c236f94cfe233dc7d8da6c0eebfc4badadf715816' 
  AND token = 'L5EFt8srykqby5d9XZDaFX3Y6jfPu6RSUBL7+QZcg+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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