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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e9af1c52dc14279c7f29c9f3b54b5ddb79b1d19dba5fe1daa8c501da68ebf1' 
  AND token = '0VEkE/o9ncfFVmWsQvQdjXaK1VaOBQgOjZ3UHFwO3wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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