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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b763ebe8cefab6ef70e8dd8404eddcbd0b14874674a91337934ce92fd1a9835b' 
  AND token = 'qqsV6QO9zzIFS+hnk839UUEdh1Qr9OOjzT6TiHZXm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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