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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afb661e015b364750591c5e0093dc78fb764e175bfcb9546ca53d1366c9aadf' 
  AND token = '1WHsLVrARRNIkT7dCNyXsllEslFcA/vGqh3ZpgWIFgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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