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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38c02141e6a6a908db30616e3553e2fa52949a5172cb28f0ca448922d4a38dc' 
  AND token = 'dM4KPniZ9xLVUispaTXa8olTC9tukNbNjxZpC5wqBnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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