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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71515577e6ae06eee9a04cdd33263ba6e03328c9bd8b8d0f28df18153ecddc00' 
  AND token = 'Ffn5/LZKMbqUlqk+T5kKPUfzuOW4CQDyHHTRErmNrUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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