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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619ab8ba5c2b41d3e1e2798acbc74e940d04b3acc7dbbfcb35a88458f28d7770' 
  AND token = 'z0fsbOZ+AcZfZHKrpLj1XYWQYFDIXmD+RUIR0hxGzoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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