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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba28caca8a7b051a9217aebce6aac9de38260a10d1181de3b8d6cab65b59a6be' 
  AND token = 'abuzKN7SV0VMFNGbVVxy85pjcqzeQVhVhKosOgvvg9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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