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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b7cfcd60728efd294978436ec3218c2ec4422f100c438f6f2a895d0c98bea9' 
  AND token = '4Bw6A3ofXp9w9rVncdcuiFDjklikEcljMho6qNjdWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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