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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd00e0258cd6e0835de1987d88042b63d95e4c42d731a80ffcd9507b0c097d9' 
  AND token = 'P49UWh/U1fXLNZCb7cgTzaTlqOIc37DXS4UQ64zhask=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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