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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf948b1ca0d73f5138ca8005fc5c3214605b3095d6b93373801e0c40513aadc' 
  AND token = 'ZIuWiJLBJE5XXZ2EuOVYTzdQnR6nTXGmsiJR30yQS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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