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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68b59697040ee6efbef5d9ae8a77ced15e5dbd6b0077d4f9710211c45529ec8' 
  AND token = 'tMYodT9DH/92RvKjHq3DL0n/06dyAWQ34wcSEbb+AK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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