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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9915a561b63c84d99ba5d2dfcdb3dfef85e64fd353938913aad236e064c58fa3' 
  AND token = '6J9ZHxzhSBPXArDBD7iLmhMoaBDgp3k5/q4390X795Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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