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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23dc5b13e3e07603595e527afa3ae83b522e6ffd633ae084de91d1791519201' 
  AND token = 'tlOrXzuD2UPzVtxNTgzVPA4Gy8lCJnZUTOci67BMLP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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