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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e382a9815b6a6c24675a19a6f2df10fe3bafe64d824729d6a54fabed50d197b' 
  AND token = 'Wj1eHsea8BWWgZnjBr7dbg80GMD9stOupnO1MRHjIk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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