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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44009cd2eb0111b74346253e19a43bf39585b3a1818d1eb128492226303ba333' 
  AND token = 'y2FmKzHr7eZMER5k4H8GJkYQDLh0CLuGmxk4VBUQ8uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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