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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f3bc511e0379012c15e7040c47b736a7142463e2e31134a293fd30c5613627' 
  AND token = 'UIXbVa3M0A3FCbqz5EXai2o2EG8nMgvxjs6lm8cx+co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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