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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01915fbf867847e002c5f98766926343f5cd706645eecfb13b2c794babc351f' 
  AND token = 'Fm3mE48vU0/p5usFeMMrY6r7W0MjTAi9Vn7p1W9cs38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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