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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4374aa3263ec745afecca1f4786e6af60182b2c5b099e07bfe31cd50d9999f' 
  AND token = '9D1Z17mIZyGD3WSNySBs06SMy6PDAnjw2rCCxNWrR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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